Plaster applying mechanism



April Filed June 15, 1945 A. sALMAN ETAL PLASTER APPLYING MECHANI SM 3 Sheets-Sheet 1 ATTORNEYS.

A. SALMAN ET AL PLASTER APPLYING MECHANISM April 5, 1949.`

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SM EL @n a Patented Apr. 5, 1949 PLASTER APPLYINGv MECHANIS'M' Abe Salmanand Malcolm hartlett, Cincinnath.l Ohio; said` Bartlett assigner tosaid Salman Applicatinlune" 13`y 1945,- Serial-No. 599,254;-

(CL. 'l2-130) 15. Claims. i

Our invention relatesi tiomechanical; means for applying plastic or semi-plastic coating; material to surfaces which may rangefrom horizontal to vertical. Designed* primari1yy as' a# means for applying.vr plasterto the wallss and ceilings of lonildingst our'structure" iscapable of, zother uses, andI may be employed for applying other`- substances.

Anl object; o'iour inventionis the provision of successful. mechanism for' progressively applying' controlled coatings: orv plastic to such `surfacesaswalls.

It is ourv object' to'provide' a. mechanism which iis-readily portable; readily assembled, and easily installed -or setup to function: in' any one posi'- ticn with' great accuracy; Itisour'object to :provide a. mfechfanismawhiclr. may be adjusted from position to position quickly-andi accurately.

Devices' for` applying plastics to walls, hereinafter' referred st-o asv plastering machines;` have hitherto been suggested; but have` not proved successful'. Yet" it hasA been knownY that substantial savingsA as well as' a more uniform result could be realized with: very much lesslabor if the bulk of: the plaster, at least, could bei applied by machine.. There' are numerous prololer'nsy involved inthe provision of operative' mechanism to this end, and important objects of' the i'r-iven'tionv relate to' the solution of thesek problems, as will hereinafter become apparent.

These and other objeetsof our invention which will' be apparent` toi one* skilled in thel art upon reading thesespccilications orwill be made clear as the description proceeds,. we' accomplish by that construction 'and' arrangement of parts of which We will: now describe an exemplary embodiment. Reference is n'zvade tol the drawings which formparthereof, and in'which:

Fig. 1 is asideY elevation of our machine.

Figs.. 2', 3, 4, and 5 are partial sectional views thereof.l taken on correspondingly numlcered section lines in Fig. l.

Fig.- 6' is a, partial sectional view taken on the line 'i-ii of Fig. 7.

"I is a view similar ltoFig. 1.but with the mechanism in a partially elevated position.

Fig, 8 is a sectional view taken on the line tlf-8 ofFig.; 7'.

Fig. 9` isa plan View' of our machine.

10 is a sectional View of the 'hea'dmechanism'-- taken on' the line Ill-IU of' Fig. 9.

lil is a partiall sectional view thereof, taken on' the line l l"l ofliigli'r'eV IOL :Eny the practicing ofA our invention we deliver the plastic material to the lsurfacel under pressure throughL a nozzle. The nozzlehas mechani- N m'entalities.

2. cal mounting an'diactirating'meanshereinafter-ree erre'd to as'` ai. head.. The nozzle is soy mounted and., actuated: loyI the? head' and mechanism therethat it is caused; mechanically to perform ai traversing. operation; Thus with the headY sta'- tion'ary.; the mounting :and: actuating. means is capable'. or causing'. the nozzley to. move in such` fashion: thatithei delivery` end: of: it.;has a straight line-i traverseY in. aedirection parallelv with one edge of-the frame or'head. The' extent of this'traverse" may,` be vari'ed: not. only. by' design and construction of the head itself but 'a-lsobyf' thev length ot time' during: which@ the* actuating` means isA moved. The nozzle is of: substantiale widtlr in yone direction. and: :at: each side: edge it' bearsy smoothing plates appropriatelyf mounted: Means are providedfto-` causeE one or fthe' other rof' these smoothing? plates to m'ove out of :the way at each end' of the traverse' `of the nozzle on the head, the purpose of this being: toy permit the nozzley to enter and conform closely? to corners between wallse The hea'dr is mounted; ina portable frame which isi seti up in! parallel-ism: to' a Vertical' surface to be plastered. 1andis moved sidewifse from time to time asf may be'vr'equired'. The head has power Iactuated movement inthe frame. The combination. of the' twomrovementsmentioned-the movement of the nozzle withrespect to the head and the movement offV the' head with respect to the frame-determines' the length ofr the over-al1 stroke of themachine and.. without .other Iadjustment. may be varied by controlling the movement means for either or both of'these instru- 'Rhei movement: 4of the nozzle with respect'l to` thel head and the movement of the head `with respect tothe frame are preferably though not necessarily` concurrent. Thus we are enabled; for example; so to operate our mechani'sm that the nozzle, starting at the corner formed by thel floor with the side wall of the building,4 can. applya continuous vertical stripe or plaster from that'. corner to the corner formed by the Wall and' the ceiling', the width -of the stripe depen'dingupon the wid-th Iof the nozzle.

When such a stripe has been formed, the frame may be moved si'd'ewise.A so as to prepare the mechanismv for @thev application of anl ladjacent verti'c al' stripe'.-

The head may het relocated in the frame in suchf mlanneras to.- apply plaster to wall sections in other than vertical'. positions including horizontal wall sections such as ceilings. One featurecf our' equipment isthat the traverse of the nozzle`v respect tothe head? is a traverser of walls so that the length of the traverse may be extended.

It is also to be noted that because of ithe provision of a head with respect to which the nozzle has a traverse of very substantial length and because of the provision for the movement of the head with respect to fthe frame, we are enabled to provide a mechanism which without disassembly and rearrangement or structural lengthening can be caused -to apply pla-ster on vertical walls from the floor to the ceiling for all of the varying wall heights reasonably to be expected in any particular class of building construction.

Referring first to Figures 9 and 10, we have shown a head in the form of a frame of spaced members I0. At one side of the structure the spaced members diverge to form parts more remote from each other, each such part presenting an outer edge II serving, as hereinafter set forth, as a trackway. The head is suitably braced as may be required, and can be constructed in any suitable fashion. For example, it may be a single casting, or it may be fabricated from individual members.

On the rear edge of the head we mount an ear or ears I2 which bear a pivot shaft I3 passing through a slot I4 in an arm I5 which may, if desired, be of bifurcated construction as shown. The arm also bears a shaft I6 which engages in the slot of a fork member Il, The other end of this member is perforated and threaded to accept a threaded shaft I8 journaled as at I9 and 20 in bearings on the head. The shaft I8 being rotatable but held against movement lengthwise in its bearings, it Will be evident that rotation of the shaft will cause the fork member II to move up or down depending upon the direction of rotation. Since also the fork member I1 engages the shaft I6 of the arm I5, it will be evident that the arm will be rocked angularly during such movement of the fork member.

'Ihe head is provided with one or preferably two cam tracks 2|. On the ends of the arm shaft I6 we mount cam following rollers 22 which ride in the cam tracks. The cam tracks are so shaped as to move the arm I lengthwise during its rocking motion already referred to and in such manner that the end of a nozzle mounted upon the arm follows a straight line or uni-planar path throughout the swinging movement of the arm.

A nozzle member 23 is bolted or otherwise attached to the arm I5. From the place of attachment the nozzle flares outwardly laterally as shown in Figure 9 but becomes narrower in the opposite direction as shown in Figure 10. Hence the nozzle outlet is of slot shaped form, having considerable length and a very much smaller transverse dimension. The flange means 24 by which the nozzle is attached to the arm is prolonged as at 24a (Figure 9) and the adjacent portion 23a of the nozzle is enlarged sidewise so as to provide for connecting a flexible tubing 25 to the nozzle in communication with its interior so that plaster may be delivered to the nozzle under pressure, The nozzle end carries a pair of smoothing plates 26 and 21 hinged to it at their ends as at 28. Each of these smoothing plates has arms 29 or 30 bearing roller means 3I. 'I'he arms are so positioned that as the nozzle is moved up and down by the arm, the roller means 3I engage and ride along the track ways II on the head extensions. These trackways lie parallel to the path of movement of the outer end of the nozzle. Hence the trackways, rollers and arms serve to keep the smoothing plates in a fixed relation to the surface to which plaster is being applied throughout the extent of the trackways. This relationship with the surface being treated is maintained in spite of the tilting of the nozzle 23 as it moves up or down, as will be evident.

The smoothing plates may be arranged so as to be coplanar and parallel; but we prefer so to arrange them that they slant outwardly from the nozzle end toward the wall so that they assist in forcing the plaster toward the wall during their movement with the nozzle, thus helping to key the plaster into the interstices of the plaster receiving support, e. g. lathing.

However, the traverse of the nozzle end extends beyond the ends of the trackways II so that, in both the upper and lowermost nozzle positions as shown in Figure 10, one or the other set of arms23, 30 rides over the end of the trackways I I so as to permit the plate to which such arms are attached to swing into a horizontal position or a position at which it lies substantially at right angles to the other smoothing plate which is still being positioned by the trackways. This is illustrated for uppermost and lowermost positions in dotted lines in Figure 10', and it will be apparent that when the nozzle is in its uppermost position the uppermost lsmoothing plate has swung to the horizontal so that the nozzle can get up into the corner formed between a vertical wall and a ceiling. Similarly in the lowermost position the noz-A zle is enabled to get down into a corner between a vertical wall and a floor.

In order to cause the arms to follow the trackways I I and adjacent portions of the head frame, we provide means for resiliently urging the arms against the trackways. One such means comprises a coiled tension spring 32 interconnecting the smoothing plates 26 and 21 and passing through a lined orifice 33 in the nozzle. The closed walls of the orifice do not interrupt the flow of plastic material through the nozzle body but on the contrary serve in part at least to distribute the flow. Vanes and other distributors may be included within the body of the nozzle if that be found desirable.

On the end of the threaded shaft I8 We have shown a bevel gear 34. This meshes with another bevel gear 35 mounted on a shaft 36 journaled in the head. 'To the shaft 36 we attach a power means such as an electric motor either directly or through the intermediary of a suitable gear box or speed reducer. The motor is to be found at |20 in Figures 9 and l0. The motor is a reversible motor capable of rotating the threaded shaft I 8 in either direction as desired. It is preferably equipped with adjustable automatic switch means serving to cause it to operate in a given direction at speed for a given length of time. Upon the 'actuation of a starting switch the limit switch mechanism may thus be set to produce automatically a traverse of the nozzle from the lowermost dotted line position in Figure 10 to the uppermost dotted line position and there stop the traverse. A reversing switch may be employed to produce traverse of the nozzle in the opposite direction and may be controlled by the same limit 5. switch on another for preventing' overrunning; as will be understood.

It: will now bef seen thatthe mechanism thus fardescribed,A ifsupported with the trackways Hipara'llel to a surf-ace. to which plastic is tobe applied, iscapableofi producing a substantial traversey of the nozzle. keeping thev nozzle end moving in parallelism. with the; surtace; throughout the traverse and; if plastic be supplied to;- the nozzlevr at thev proper rate through the tubing. 252, is: capable of' applying that; plastic toy the; said surface in a stripe determined' in width by the longer dimension of the nozzle end. and in lengt-h by the length of nozzle traverse. liurthermcrea at' each end of. such; stroke the. nozzle is capable ofyentering corners between thesaidsurface and another. The smoothing plates. are continuously active throughout the traverse, one or thev other being; automatically drawn out of the. way atthe ends of the traverse. The longer dimension of the nozzle en i: may be varied, aswill .he evident; and the, structure of;l the head maybe changedto varyf the length` of the stroke. Inan exemplary machine, our headsand nozzle combination applies a ,stripe of plasterapproximately 2. feet in width in. a stroke approximately 4 reet in length.v

We mount our head with respect to a framework in which the head as; such. is longitudinally movable. The extent of movement: of: the head inthe trameA isthus added to the extent ot movement of the nozzle with respect to the head in such fashion that the eiective length ofv the noz zle stroke is theA sum of the two.

Ourframe construction-y isillustrated in. Figures l to 8 inclusive O n a suitable basel Blnwe mount fouruprights 3S, ill and di.; The base may be a cast membery having integral sockets or thelike (not shown) to receive the ends ot the uprights and hold them rmly in the vertical position. The base 37 may be provided with castersV or the like d3, lili, d and G5., upon which the frame maybe moved. It is within the purview of our invention to provide track means, for example, along the floor of a room parallel` t0. aside wall and cause the casters 43; 4.4, d5. and 46 to move along the trackway to facilitate the. lateral movement of the frame during a job of plastering. This is not, however, generallyv nec'- essary; and the frame may be moved about upon the iioor of a. building on the casters or upon i- .skids where casters are not employed. Especially where casters are employed, weprefer to pro,- vide a means for aixing our fra-me in a selected position on the floor so that it will not. move dur:- ing` the course of a plastering stroke. such locking means may be employedA and will .suggest themselves to skilled workers in the artg. In practice we perforate the base 31 at the bottom. of one or more of the uprights 38, 33, 4i) and 4l (which are in the form of hollow members, v,

Such threaded rods, if provided as. describedv at the corners ot the structure, areA also useful in leveling it up where the. floor is characterized by unevennesses or the plane of it is not perpendicu lar to.. the plane of the side wall to be'plastered,

The threaded rod construction has not been.; i1.-

lustrateetfin. the drawing-s butv will ne. readily 'understooclV by" the skilled` worker in the art inthe lightnof our description.

The base 311. holdsthe upright in spaced relationshifpfatthe bottom.. At the topadjacent pairs of the uprights are-spaced andiastened together by ibridge members-.indicatedrin the several fguesfat'tfandfd.

Theuprights. 3.81, 39', Mlvand lli serve as ways upon` which subframe members are slidable. Eheseisu'birames comprise members 49;, 5d and. 5! on each side. Each of these members is in the term of an elongated loop-shaped element the end inside-surfaces of which engage and slide alnngrthevuprigjhts. The elements. llB, 5i) and; 5t are` interconnected vertically by elements 52and 5:3,- These; elements: are convenientlyr in the form oli. angleirons attached to. squared corner por tionsaof the transverse; sliding membersv t9., and 5l: asv-indicated; in the several figures at 49a, 59a and 5ta; Inner side edges of these angl-e iron-s projectbeyond the squared'- corner portions 49a, etc, so as to provide trackways uponwhicha head supporting. means is vertically slidable.

They head supporti-ng. means` comprises end plates 54- andg: 5.5i; theside edges of which are grooved (as mosty clearly` shown in. Figures 6 and 99r to receive theedges of the angle ironsiidand 5.3: The plates 5d andf may be interconnected by a plurality of -rodl members 5.6, 5.6.', 5l, 58., 591, till-and dit. The. headisymounted with respectv to severalof thesefrods as hereinafter explained;

We thus have arnain frame comprising the uprightsed, 31S, dell? and 4l upon which sub'frame members.l are vertically slidabl'e, a` head; support 'being vertically slidable upon the subframe. The bod-ih7 IrlovernentV of. the head'. (attached to the-head support);` will thus be the sum of the traversesof the head support; and the subframe withy respect to. the main frame and to each other.

We mount a-motorf? on the Ibase Jil' and conneet it by, asuitabl'e drive 'toza gear box or like speediredncer-tli alsoimounted on the base` The speed reducer is connected 'by a drive 65.1 to a sheet 616 journaled on. the base in suitable bearings, one of which is;v shown at 6.7' in Figure l; The ends oftheshaft carry sheaves @3.1 and (i8 for1 Vertical, end-less belts-chains or the like. at either side of; the; machine; One of these vertical iexible means i's shown. in Figure l. at T0.. It Passes over` a sheave lli suspended: by means of a fork li?. andarod 'lf3l trom the bridge memberv 41. A,L similar constencti-onA is provided at. the opposite side` ofv the machinel with the upper sheave similarly` suspended; from the bridge t2.

At, one point the flexible memberv lil is anchored totheysubframe on-'its side as indicated at '14. in;ligures, 1 and 7@ The opposite exible member is., similarly anchored to the opposite subfraine.. Itr will new` he understood that as the shaft 6.6i. is rotated in a. clockwise direction (Eigure l)y the, subfranes are raised.. They" will. be lowered if the shaft is rotatedin a counter-clock,- wise direction.

We alse mount sheavesone of which is shown at T5" in Figures 1' and '7,` inA suitable bearing members on' the lowermost transverse elements 5l of` the subframes. Flexible endless. means such as belts, chains, or thelike extend from these sheaves tosheaves 'I'SA and 'Vl' mounted on or suspended from the top members 4% ofthe suhframesz; In Figures 1 and'. 7 we have shown thegsheave 'Mii suspended' by. aifork 'Hx andi a rod One' of the flexible elements is indicated in these gures at 19. This flexible element is in- -dicated as anchored at 80 to a bracket 8| amxed to the upright 38. The flexible element 19 is also anchored as at 82 to the end plate 54 of the head support. A similar construction is employed upon the opposite side of the machine.

As the subframes are moved upwardly, they carry with them the sheaves such as 15 and 16; but since the flexible element 19 is anchored at 80, it is caused effectively to run around the sheaves, rotating them. Also since the flexible element 19 is anchored as at 82 to the side plate of the head support, an upward movement of the subframe causes an upward movement of the head support at double the speed and for double the distance. If the subframe members are thus caused to move upwardly 2 feet, the head support will be caused to move upwardly 4 feet.

The over-all height of the base plus the uprights 38, 39, 40 and 4| is preferably chosen to be such that the apparatus may be readily moved about and passed through doorways of regulation height without tilting. 'I'he subframe members are substantially shorter than the over-al1 length of the main frame. The subframe members are capable of sliding up to the top and beyond the top of the main frame supports. The end plates 54, 55 of the head support are capable of sliding through the length or even beyond the upper ends of the subframe members. Hence the total traverse of the head support can be made very substantially greater than the total length of the uprights 38, 38, 40 and 4|. Thus the overall height of our frame apparatus when the subframes and head support are in lowered position can be kept short, say, not more than 6 to 7 feet, while the total traverse of the nozzle may be up to 11 or 12 feet, giving us an ample traverse for buildings of the dwelling class as well as usual buildings of other classes. Needless to say, our frame construction can be elongated for other uses and other types of buildings, as well as for outside work as in stuccoing the exterior of buildings.

The motor 62 is preferably provided with limit switch mechanism such as that described above in connection with the motor for the head, the limit switch mechanism being adjustable to control the over-all length of stroke of the head support with respect to the main frame to a value which, added to the stroke of the nozzle on the head will provide the desired length of plastering stroke. It is not necessary that the head motor be actuated at the same time as the motor 62. By the provision of suitable switches the stroke may be made separate and sequential. We prefer, however, to make them simultaneously because smoothness of operation is promoted in this way. The nozzle may start at the floor line in the lowermost position shown in dotted lines in Figure l and in a continuous sweep upwardly produced concurrently by the movement of the nozzle with respect to the head and the movement of the head with respect to the main frame, it may end the stroke at the ceiling line in the position shown in the uppermost dotted lines in Figure 10.

The head is demountable from the head suD- port and the arrangement of the several head support rods is such that the head may be mounted upon the head support in the position shown in Figure 3 for the plastering of vertical surfaces, or in a position at right angles thereto 8 for the Yplastering of overhead horizontal surfaces.

The head is mounted upon rod 58 by means of an ear on the head indicated at |2| in Figure 10. In the position shown in that figure, the head rests against rod 51 at its back, and against rod 5| on the bottom, being held down by rod 56 at the top. Rod 56 is not in place. When it is desired to change the position of the head, rod 56 is removed, and the head swung upwardly on rod 58 as a pivot until it comes against rod 59. Rod 55 is then inserted to prevent reverse swinging of the head, and rod 56 is reinserted to assist in holding it in place.

When horizontal overhead surfaces are to be plastered, the head may be swung, as described, with respect to the head support and a portion of the overhead surface plastered in a single stroke, the length of which is the length of stroke of the nozzle with respect to the head as produced by the head motor. In this event, the subframes and head support are employed to fix the height of the head, but are not moved during the plastering stroke. It is possible, however, to dispose our frame mechanism horizontally on suitable supports (not shown but readily understood) by which it may be located parallel to and the proper distance from an overhead horizontal surface and use our frame construction and its motive mechanism to increase the length of stroke of the nozzle just as in plastering vertical surfaces. Also with a suitable trackway or on a level floor, the frame may be moved either along a wall or away from it. It is likewise possible to suspend our frame horizontally above a floor and employ our mechanism for laying plastic type or cementitious flooring.

Modifications may be made in our invention without departing from the spirit of it. Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

l. In a means for applying plastics to surfaces, a head mechanism comprising a framework, a pin mounted in said framework, a slotted arm slidable and rotatable on said pin, means for imparting to said arm a rocking movement about said pin, a nozzle having an orifice attached to said arm through which plastic material may be forced, and cam means for guiding said arm and acting to slide it on said pin during its rocking movement to keep said orice of said nozzle moving in a flat plane.

2. The apparatus claimed in claim 1 in combination with means for supporting said head adjacent a surface to which plastic is to be applied with the plane of movement of the nozzle orifice parallel to said surface, and means for supplying plastic under pressure to said nozzle.

3. In a means for applying plastics to surfaces, a head mechanism comprising a framework, a pin mounted in said framework, a slotted arm slidable and rotatable on said pin, means for imparting to said arm a rocking movement about said pin, a nozzle having an orifice attached to said arm through which plastic material may be forced, and cam means for guiding said arm and acting to slide it on said pin during its rocking movement to keep said orifice of said nozzle moving in a nat plane, said frame having a portion with an edge paralleling the plane of movement of said nozzle orifice, smoothing plates pivoted to said nozzle orifice on each side thereof, said smoothing plates having means for contacting said edge whereby said smoothing plates are kept with surfaces in said plane of movement of the no'zzle orica said edge. terminati-ng .at :the Sends l'of the path .of movementaof said nozzle Aorifice :and joining other surfaces whereby in .extreme positions lof said nozzle `orifice one kofsaidlsmoothing plates Vwill ride over theend lof said edge onto 'said adjacent surface bringing said smoothing "plate to a position substantially atvright angles to the other smoothing plate.

'4. In a plastering machine, a head "mechanism comprising spaced members, `a slottedarmlying therebetween and pivoted on means 'passing through the slot in said arm and `fixed in vsaid members, a threaded 4shaft vjou-rrraled ron Asaid members and bearing Ia vnut with a lslotted 'exten`- sion, a pivot on said arm engaging in said slotted extension whereby movement vof the nut along the shaft will cause said varm 'to rock about'said irst mentioned pivot, 'a camtrac'k in one "at 'least of said members `in which said last mentioned pivot on said arm engages, a nozzle on the 'end 120 of said arm remote from said first pivot, sai'd'cam track acting to produce longitudinal 'movement .of said arm with respect to said first mentioned ,pivot during its rocking motion thereabout whereby the orifice of said nozzle follows a path '25 .lying in a flat plane, and means forrotating ysaid shaft so as to produce rocking movement of ,said arm so that when plastic material is 'forced through said .nozzle it is applied thereby to a wall or the like'to form a coating thereon with .a surface lying in said plane.

5. In a .plastering machine, a' head mechanism comprising spaced members, .a slotted arm 'lying therebetween and pivoted on means passing .through the slot in said arm and .fixed in said members, a threaded shaft journaled .on said members and bearing a nut with a slotted extension, a pivot on said 4arm vengaging in .said slotted extension whereby movement of the nut along the shaft will cause said arm to rock `about; said "M first-mentioned pivot, a cam trackinone at .least of said members in which'said last mentioned pivot on said arm engages, a nozzle on the end of said `arm remote from said iirst pivot, said cam .tra-ck acting to produce longitudinal movement surface lying in said plane, said nozzle orifice Y being of small dimension in the direction of motion of said .arm and .being extended transversely so :as to apply plastic material in a wide stripe.

6. In a pl-astering machine, a head mechanism Icomprising spaced members, la slotted arm lying therebetween and pivoted on means passing through the slot in said armnand ixed in said members, a threaded shaft .jcurnaled on said members and bearing a nut with ka slotted extension, a pivot :on said arm engaging in said slotted extension whereby movement ofthe nut along the shaft will cause said arm to rockfabout said iirst mentioned pivot, acam tra-chin yoneiat least of saidzrnembers inJwhich-said last mentioned pivot on said arm engages, a nozzle on thevend of said arm remote from said first pivot, said cam track acting to produce longitudinal movement yof said .arm with respect to said first mentioned pivot during its roc-hing motion thereaboutwhereby the oridceof sa'idnozzle follows a path lying in 'Va flat plane, and means forrotating said shaft iso as to produce rocking movement of .said arm s that 'when plastic material isi l,forced through said nozzle it-is applied thereby .to :a wall or thelike -to form acoating thereon'with surface 'lyirig in said plane, said Anozzle 'forific'e beingwofsmall dimension in the direction of motion-ei'sai'dfarm and being extended transverselyvso asfto -apply plastic vmaterial in la wide {stripeythe plane fof amo-vement off said nozzle .oriii'celbeing parallel ft'o edges of said frames at one side, and smoothing plates pivoted to said nozzle and controlledlby members riding -on-:said `edges so fas to be maine -tained parallel -t'o Ithe plane 'of movement of the :nozzle ori-lice throughout the greater-portion ro'f the swinging motion rol said arm, said frames*-be yond-said parallel edges having edges at rig-ht angles thereto, and the members riding on-said edges being adaptedv to pass beyond the ends jof said parallel edges at each extremity vof the rocking motion of said arm, ontosaid right angle Iedges 'to bring the 'plates controlled 'therebyto positionsV at right Iangles to said plane.

7. In av plastering machine, a 3headfmechani'sm comprising spaced members, a kslotted arm lying therebetween and `p'ivoted 'on Ameans passing through the vslot in said arm `and vfixed 'in said members, a 4threaded shaft.journaled'on"said members and bearing a nut with a slotted 'eXtension, va ypivot on said 'arm engaging insaid slotted extension 'whereby movement 'of the-nut along the shaft will kcause said larm to rockA vabou'tsald rst mentioned pivot, a cam track'in one -at least of said members in which `said vlast1'mentioned pivot on said 'arm engages, a'n'oz'zle on theerrd of said arm remote from said first pivot, Asa'ii'lcafn'l ytrack actingto `produce longitudinal Jmovement Aof said arm withrespect'tosaid first mentioned 'pivot during its rocking motion 'thereabout wherele'y'the 'orice of said `nozzle vfollows a path iyin-g in a flat plane, and means'for rotating said 'shaft so 'as to'produce rocking movement of said arm so that when .plastic material vis forced through `-said nozzle it is applied thereby toa wall or the like toform a 'coating thereon with a surface lying in 'said plane, said nozzle `orifice being of small dimension in the direction 'of lmotion of said arm and being extended transversely so as to apply plastic material in a lwide stripe, lthe plane of movement of said nozzle orice -being parallel to edges of'said'frames at one side, 'and smoothing plates pivoted to said nozzle and controlled by members riding on `said edges so 'as'to be maintained parallel to the plane of movement of the nozzle 'orifice throughout thegreater portion of the swinging motion of said arm, 'said 'frames beyond vsai-d parallel edges vhaving edges 'at right Iangles thereto, and the members 'riding on `said edges being adapted to .pass beyond the `ends of said parallel 4edges'at each extremitydf the rocking motion of said arm, and onto'said right angle edges tobring the plates controlled thereby to positions 'at `right angles to saidpla'ne, lsaid nozzle being in the'form 'of 'a hollow meme ber having 'means for "the supplying lof plastic material thereto, said plates being interconnected by resilient means passing through a lined perforation in said nozzle.

8. In a plasteringmachine., the combination f a vertically extending supporting means whih may be juxtaposed to a wall, a head Vmounted for vertical sliding movement in said supporting means, means for 4moving saidvhead up and down therein, an arm journaled in :said head, a nozzle having an :orice mountedonthe end of said arm., means on `saidhead for moving .saidvarm with Vancienne4 a rocking motion, means on'said headY for constraining the motion of said arm to cause said nozzle to traverse during said rocking movement a path lying in a flat plane, means for supplying plastic material to said nozzle and means for concurrently controlling said head and arm moving means so as to cause said nozzle to traverse a vvertical surface of greater length than the height of said head and the height of said supporting means.

9. In a plastering machine, the combination of a vertically extending supporting means which may be juxtaposed to a wall, a head mounted for vertical sliding movement in said supporting means, means for moving said head up and down therein, an arm journalled in said head, a nozzle having an orice mounted on the end of said arm, means on said head for moving said arm With a rocking motion, means on said head for .constraining the motion of said arm to cause said vnozzle to traverse during said rocking movement a path lying in a iiat plane, means for supplying plastic material to said nozzle and means for concurrently controlling said head and arm moving `means so as to cause said nozzle to traverse a vertical surface of greater length than the height of said head and the height of said supporting means, said supporting means comprising vertical trackways, a subframe mounted for sliding movement on said vertical trackways, carrying means for said head mounted for sliding movement on said subframe, said means for moving said head comprising means enforcing concurrent movement of said subframe and said carrying means for said head.

10. In a plastering machine, the combination of a vertically extending supporting means which may be juxtaposed to a wall, a head mounted for vertical sliding movement in said supporting means, means for moving said head up and down therein, an arm journaled in said head, a nozzle having an orifice mounted on the end of said arm, means on said head for moving said `arm with a rocking motion, means on said head for constraining the motion of said arm to cause said nozzle to traverse during said rocking move- ,ment a path lying in a at plane, means for sup- 'plying plastic material to said nozzle and means moving means so as to cause said nozzle to traverse a vertical surface of greater length than A the height of said head and the height of said supporting means, said supporting means comprising Yvertical trackways, a subframe mounted for sliding movement on said vertical trackways,

carrying means for said head mounted for sliding movement on said subframe, said means for moving said head comprising means enforcing 4concurrent movement of said subframe and said carrying means for said head, said nozzle having smoothing plates pivoted to each side of its orifice and means forV controlling said smoothing plates to keep them in a vertical plane excepting Aat the ends of the traverse of said arm.

` 11. Ina plastering machine, the combination of a vertically extending supporting means which may be juxtaposed to a wall, a head ,mounted for vertical sliding movement in said movement a path lying in a ilat plane, means for supplying plastic material to said nozzle and means for concurrently controlling said head and arm moving means so as to cause said' nozzle to traverse a Vertical surface of greater length than the height of said head and the height of said supporting means, said supporting means comprising vertical trackways, a subframe mounted for sliding movement of said vertical trackways, carrying means for said head mounted for sliding movement on Said subframe, said means for moving said head comprising means enforcing concurrent movement of said subframe and said carrying means for said head, said nozzle having smoothing plates pivoted to each side of its orifice and means for controlling said smoothing plates to keep them in a vertical plane excepting at the ends of the traverse of said arm, said head being mountable on said head carrying means in an additional position in which the path of movement of said nozzle orifice lies in a horizontal plane.

12. In a plastering device or the like, the combination of a portable main framework, a subframe slidable thereon, a head carrying means slidable on said subirame, a motor on said main frame, transmission means between said motor and said subframe, and between said subframe and said head carrying means whereby operation of said motor produces concurrently a movement of said subframe with respect to said main frame, and a movement of said head carrying means with respect to said subframe, and a plastering device comprising a head, a nozzle having an orice mounted with respect to said head for planar movement of said orifice, a motor for actuating said nozzle, and means for controlling said motors to produce concurrent movement of all of said elements with respect to each other for effecting a plastering stroke.

13. In a plastering device or the like, the combination of a portable main framework, a subframe slidable thereon, a head carrying means slidable on said subframe, a motor on said main frame, transmission means between said motor and said subframe, and between said subframe and said head carrying means whereby operation of said motor produces concurrently a movement of said subframe with respect to said main frame, and a movement of said head carrying means with respect to said subframe, and a plastering device comprising a head, a nozzle having an orice mounted with respect to said head for planar movement of said orifice, a motor for actuating said nozzle, and means for controlling said motors to produce concurrent movement of all of said elements with respect to each other for effecting a plastering stroke, said nozzle having smoothing plates pivoted to the orifice thereof, and means for causing said smoothing plates to remain in the plane of movement of said nozzle end during the stroke thereof.

14. In a plastering device or the like, the combination of a portable main framework, a subframe slidable thereon, a head carrying means slidable on said subframe, a motor on said main frame, transmission means between said motor and said subframe, and between said subframe and said head carrying means whereby operation of said motor produces concurrently a movement of said subframe with respect to said main frame, and a movement of said head carrying means with respect to said subframe, and a plastering device comprising a head, a nozzle having an orifice mounted with respect to said head for planar movement of said orice, a motor for actuating said nozzle, and means for controlling said motors to produce concurrent movement of al1 of said elements with respect to each other for effecting a plastering stroke, said nozzle having smoothing plates pivoted to the orice thereof, and means for causing said smoothing plates to remain in the plane of movement of said nozzle end during the stroke thereof, excepting at the ends of said stroke, and means effective at the ends of said strokes for causing a leading one of said smoothing plates to assume a position at right angles to said plane.

15. In a plastering device or the like, the combination of a portable main framework, a subframe slidable thereon, a, head carrying means `slidable on said subframe, a motor on said main frame, transmission means between said motor and said subframe, and between said subframe and said head carrying means whereby operation of said motor produces concurrently a movement of said subframe with respect to said main frame,

and a movement of said head carrying means 20 Number with respect to said subframe, and a plastering device comprising a head, a nozzle having an orice mounted with respect to said head -for planar movement of said orifice, a motor for actuating said nozzle, and means for controlling said motor to produce concurrent movement of all of said elements with respect to each other for effecting a 'plastering stroke., said nozzle having smoothing plates pivoted to the orice thereof, and means for causing said smoothing plates to remain in the plane of movement of said nozzle end during the stroke thereof, excepting at the ends of said stroke, and means eiective at the ends of said strokes for causing a leading one of said smoothing plates to assume a position at right angles to said plane, and means for supplying plastic material under pressure to said nozzle, said means comprising ilexible tubing and plunp means.

ABE SALMAN.

MALCOLM B. BARTLETT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date 931,535 Wedin Aug. 17, 1909 1,583,283 Dunlap -f May 4, 1926 1,895,608 Conley Jan, 31, 1933 1,995,414 Blanken Mar. 26, 1935 2,168,329 Earnshaw Aug. 8, 1939 2,236,737 Stone Apr. 1, 1941 

